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<div class="title">nrf51/Board/nrf6310/pwm_example/main.c</div>  </div>
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<a href="nrf6310_2pwm__example_2main_8c.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/* Copyright (c) 2009 Nordic Semiconductor. All Rights Reserved.</span>
<a name="l00002"></a>00002 <span class="comment"> *</span>
<a name="l00003"></a>00003 <span class="comment"> * The information contained herein is confidential property of Nordic</span>
<a name="l00004"></a>00004 <span class="comment"> * Semiconductor ASA.Terms and conditions of usage are described in detail</span>
<a name="l00005"></a>00005 <span class="comment"> * in NORDIC SEMICONDUCTOR STANDARD SOFTWARE LICENSE AGREEMENT.</span>
<a name="l00006"></a>00006 <span class="comment"> *</span>
<a name="l00007"></a>00007 <span class="comment"> * Licensees are granted free, non-transferable use of the information. NO</span>
<a name="l00008"></a>00008 <span class="comment"> * WARRANTY of ANY KIND is provided. This heading must NOT be removed from</span>
<a name="l00009"></a>00009 <span class="comment"> * the file.</span>
<a name="l00010"></a>00010 <span class="comment"> *</span>
<a name="l00011"></a>00011 <span class="comment"> */</span>
<a name="l00012"></a>00012 
<a name="l00041"></a>00041 <span class="preprocessor">#include &lt;stdbool.h&gt;</span>
<a name="l00042"></a>00042 <span class="preprocessor">#include &lt;stdint.h&gt;</span>
<a name="l00043"></a>00043 <span class="preprocessor">#include &quot;nrf.h&quot;</span>
<a name="l00044"></a>00044 <span class="preprocessor">#include &quot;<a class="code" href="nrf__assert_8h.html" title="Utilities for verifying program logic.">nrf_assert.h</a>&quot;</span>
<a name="l00045"></a>00045 <span class="preprocessor">#include &quot;nrf_gpiote.h&quot;</span>
<a name="l00046"></a>00046 <span class="preprocessor">#include &quot;nrf_gpio.h&quot;</span>
<a name="l00047"></a>00047 
<a name="l00048"></a><a class="code" href="group__pwm__example.html#gaf1aeb7e936e859c23ed991a5710cb38f">00048</a> <span class="preprocessor">#define PWM_OUTPUT_PIN_NUMBER (18UL)  </span>
<a name="l00050"></a><a class="code" href="group__pwm__example.html#ga8a1b2539cc4b0524d18213da9b73deea">00050</a> <span class="preprocessor">#define MAX_SAMPLE_LEVELS (256UL)     </span>
<a name="l00051"></a><a class="code" href="group__pwm__example.html#ga10d70890ad1225e866232330b749ecae">00051</a> <span class="preprocessor">#define TIMER_PRESCALERS 4U           </span>
<a name="l00053"></a><a class="code" href="group__pwm__example.html#ga2141c8109b25266ef9bb75772414f08f">00053</a> <span class="preprocessor">static uint32_t last_cc0_sample;      </span>
<a name="l00054"></a><a class="code" href="group__pwm__example.html#gaf3984b17a772f2832fcb360ff9f5341e">00054</a> <span class="preprocessor">static uint32_t last_cc2_sample;      </span>
<a name="l00059"></a><a class="code" href="group__pwm__example.html#ga31af9c2e9f3e2c61380411894b5cb173">00059</a> <span class="preprocessor">static __INLINE uint32_t next_sample_get(void)</span>
<a name="l00060"></a>00060 <span class="preprocessor"></span>{
<a name="l00061"></a>00061   uint8_t sample_value = 0;
<a name="l00062"></a>00062   
<a name="l00063"></a>00063   <span class="comment">// Read button input</span>
<a name="l00064"></a>00064   sample_value = (~NRF_GPIO-&gt;IN &amp; 0x000000FFUL);
<a name="l00065"></a>00065   
<a name="l00066"></a>00066   <span class="comment">// This is to avoid having 2 CC events happen at the same time,</span>
<a name="l00067"></a>00067   <span class="comment">// CC1 will always create an event on 0 so CC0 and CC2 should not</span>
<a name="l00068"></a>00068   <span class="keywordflow">if</span> (sample_value == 0) sample_value = 1;
<a name="l00069"></a>00069 
<a name="l00070"></a>00070   <span class="keywordflow">return</span> (uint32_t)sample_value;
<a name="l00071"></a>00071 }
<a name="l00072"></a>00072 
<a name="l00075"></a><a class="code" href="group__pwm__example.html#ga12c8b827e5eab9d3f93d56f858e735a3">00075</a> <span class="keywordtype">void</span> <a class="code" href="group__pwm__example.html#ga12c8b827e5eab9d3f93d56f858e735a3">TIMER2_IRQHandler</a>(<span class="keywordtype">void</span>)
<a name="l00076"></a>00076 {
<a name="l00077"></a>00077   <span class="keyword">static</span> <span class="keywordtype">bool</span> cc0_turn = <span class="keyword">false</span>; 
<a name="l00079"></a>00079   <span class="keywordflow">if</span> ((NRF_TIMER2-&gt;EVENTS_COMPARE[1] != 0) &amp;&amp; ((NRF_TIMER2-&gt;INTENSET &amp; TIMER_INTENSET_COMPARE1_Msk) != 0))
<a name="l00080"></a>00080   {
<a name="l00081"></a>00081     <span class="comment">// Sets the next CC1 value</span>
<a name="l00082"></a>00082     NRF_TIMER2-&gt;EVENTS_COMPARE[1] = 0;
<a name="l00083"></a>00083     NRF_TIMER2-&gt;CC[1] = (NRF_TIMER2-&gt;CC[1] + <a class="code" href="group__pwm__example.html#ga8a1b2539cc4b0524d18213da9b73deea">MAX_SAMPLE_LEVELS</a>);
<a name="l00084"></a>00084 
<a name="l00085"></a>00085     <span class="comment">// Every other interrupt CC0 and CC2 will be set to their next values</span>
<a name="l00086"></a>00086     <span class="comment">// They each keep track of their last duty cycle so they can compute their next correctly</span>
<a name="l00087"></a>00087     uint32_t next_sample = <a class="code" href="group__pwm__example.html#ga31af9c2e9f3e2c61380411894b5cb173">next_sample_get</a>();
<a name="l00088"></a>00088 
<a name="l00089"></a>00089     <span class="keywordflow">if</span> (cc0_turn)
<a name="l00090"></a>00090     {
<a name="l00091"></a>00091       NRF_TIMER2-&gt;CC[0] = (NRF_TIMER2-&gt;CC[0] - <a class="code" href="group__pwm__example.html#ga2141c8109b25266ef9bb75772414f08f">last_cc0_sample</a> + 2*<a class="code" href="group__pwm__example.html#ga8a1b2539cc4b0524d18213da9b73deea">MAX_SAMPLE_LEVELS</a> + next_sample);
<a name="l00092"></a>00092       <a class="code" href="group__pwm__example.html#ga2141c8109b25266ef9bb75772414f08f">last_cc0_sample</a> = next_sample;
<a name="l00093"></a>00093     }
<a name="l00094"></a>00094     <span class="keywordflow">else</span>
<a name="l00095"></a>00095     {
<a name="l00096"></a>00096       NRF_TIMER2-&gt;CC[2] = (NRF_TIMER2-&gt;CC[2] - <a class="code" href="group__pwm__example.html#gaf3984b17a772f2832fcb360ff9f5341e">last_cc2_sample</a> + 2*<a class="code" href="group__pwm__example.html#ga8a1b2539cc4b0524d18213da9b73deea">MAX_SAMPLE_LEVELS</a> + next_sample);
<a name="l00097"></a>00097       <a class="code" href="group__pwm__example.html#gaf3984b17a772f2832fcb360ff9f5341e">last_cc2_sample</a> = next_sample;
<a name="l00098"></a>00098     }
<a name="l00099"></a>00099     <span class="comment">// Next turn the other CC will get its value</span>
<a name="l00100"></a>00100     cc0_turn = !cc0_turn;
<a name="l00101"></a>00101   }
<a name="l00102"></a>00102 }
<a name="l00103"></a>00103 
<a name="l00104"></a>00104 
<a name="l00107"></a><a class="code" href="group__pwm__example.html#ga9459bbd9d6c1f423f968799c09f96434">00107</a> <span class="keyword">static</span> <span class="keywordtype">void</span> <a class="code" href="group__pwm__example.html#ga9459bbd9d6c1f423f968799c09f96434">timer2_init</a>(<span class="keywordtype">void</span>)
<a name="l00108"></a>00108 {
<a name="l00109"></a>00109   <span class="comment">/* Start 16 MHz crystal oscillator */</span>
<a name="l00110"></a>00110   NRF_CLOCK-&gt;EVENTS_HFCLKSTARTED = 0;
<a name="l00111"></a>00111   NRF_CLOCK-&gt;TASKS_HFCLKSTART = 1;
<a name="l00112"></a>00112 
<a name="l00113"></a>00113   <span class="comment">/* Wait for the external oscillator to start up */</span>
<a name="l00114"></a>00114   <span class="keywordflow">while</span> (NRF_CLOCK-&gt;EVENTS_HFCLKSTARTED == 0) 
<a name="l00115"></a>00115   {
<a name="l00116"></a>00116   }
<a name="l00117"></a>00117 
<a name="l00118"></a>00118   <span class="comment">// Power on the TIMER2 peripheral</span>
<a name="l00119"></a>00119   NRF_POWER-&gt;PERPOWER |= (POWER_PERPOWER_TIMER2_Power &lt;&lt; POWER_PERPOWER_TIMER2_Pos);
<a name="l00120"></a>00120 
<a name="l00121"></a>00121   <span class="comment">// Wait for the power up</span>
<a name="l00122"></a>00122   <span class="keywordflow">while</span> ((NRF_POWER-&gt;PERRDY &amp; POWER_PERRDY_TIMER2_Msk) != (POWER_PERRDY_TIMER2_Ready &lt;&lt; POWER_PERRDY_TIMER2_Pos))
<a name="l00123"></a>00123   {
<a name="l00124"></a>00124   }
<a name="l00125"></a>00125 
<a name="l00126"></a>00126   NRF_TIMER2-&gt;MODE = TIMER_MODE_MODE_Timer;
<a name="l00127"></a>00127   NRF_TIMER2-&gt;PRESCALER = <a class="code" href="group__pwm__example.html#ga10d70890ad1225e866232330b749ecae">TIMER_PRESCALERS</a>;
<a name="l00128"></a>00128 
<a name="l00129"></a>00129   <span class="comment">// Clears the timer, sets it to 0</span>
<a name="l00130"></a>00130   NRF_TIMER2-&gt;TASKS_CLEAR = 1;
<a name="l00131"></a>00131 
<a name="l00132"></a>00132   <span class="comment">// Load initial values to TIMER2 CC registers.</span>
<a name="l00133"></a>00133   <span class="comment">// CC2 will be set on the first CC1 interrupt.</span>
<a name="l00134"></a>00134   <span class="comment">// Timer compare events will only happen after the first 2 values</span>
<a name="l00135"></a>00135   <a class="code" href="group__pwm__example.html#ga2141c8109b25266ef9bb75772414f08f">last_cc0_sample</a> = <a class="code" href="group__pwm__example.html#ga31af9c2e9f3e2c61380411894b5cb173">next_sample_get</a>();
<a name="l00136"></a>00136   <a class="code" href="group__pwm__example.html#gaf3984b17a772f2832fcb360ff9f5341e">last_cc2_sample</a> = 0;
<a name="l00137"></a>00137   NRF_TIMER2-&gt;CC[0] = <a class="code" href="group__pwm__example.html#ga8a1b2539cc4b0524d18213da9b73deea">MAX_SAMPLE_LEVELS</a> + <a class="code" href="group__pwm__example.html#ga2141c8109b25266ef9bb75772414f08f">last_cc0_sample</a>;
<a name="l00138"></a>00138   NRF_TIMER2-&gt;CC[1] = <a class="code" href="group__pwm__example.html#ga8a1b2539cc4b0524d18213da9b73deea">MAX_SAMPLE_LEVELS</a>;
<a name="l00139"></a>00139   NRF_TIMER2-&gt;CC[2] = 0;
<a name="l00140"></a>00140 
<a name="l00141"></a>00141   <span class="comment">// Interrupt setup</span>
<a name="l00142"></a>00142   NRF_TIMER2-&gt;INTENSET = (TIMER_INTENSET_COMPARE1_Enabled &lt;&lt; TIMER_INTENSET_COMPARE1_Pos);
<a name="l00143"></a>00143 }
<a name="l00144"></a>00144 
<a name="l00147"></a><a class="code" href="group__pwm__example.html#gad22626704ea5d45f863163500e355cc3">00147</a> <span class="keyword">static</span> <span class="keywordtype">void</span> <a class="code" href="group__pwm__example.html#gad22626704ea5d45f863163500e355cc3">gpiote_init</a>(<span class="keywordtype">void</span>)
<a name="l00148"></a>00148 {
<a name="l00149"></a>00149   <span class="comment">// Power on the GPIOTE peripheral</span>
<a name="l00150"></a>00150   NRF_POWER-&gt;PERPOWER |= (POWER_PERPOWER_GPIOTE_Power &lt;&lt; POWER_PERPOWER_GPIOTE_Pos);
<a name="l00151"></a>00151 
<a name="l00152"></a>00152   <span class="comment">// Wait for the power up</span>
<a name="l00153"></a>00153   <span class="keywordflow">while</span> ((NRF_POWER-&gt;PERRDY &amp; POWER_PERRDY_GPIOTE_Msk) != (POWER_PERRDY_GPIOTE_Ready &lt;&lt; POWER_PERRDY_GPIOTE_Pos))
<a name="l00154"></a>00154   {
<a name="l00155"></a>00155   }
<a name="l00156"></a>00156 
<a name="l00157"></a>00157   <span class="comment">// Connect GPIO input buffers and configure PWM_OUTPUT_PIN_NUMBER as output</span>
<a name="l00158"></a>00158   <a class="code" href="group__nrf__gpio.html#ga6d5c4a1b82ed45f7972aea6572e085f5" title="Configure GPIO pin range as inputs with given initial value set, hiding inner details. This function can be used to configure pin range as simple input.">nrf_gpio_range_cfg_input</a>(0, 7, <a class="code" href="group__nrf__gpio.html#gga07e0c8c0b30499cf0a7b79dbe62d3fcca13ffcb94eb78be866c66b5f5b516af65" title="Pin pullup resistor disabled.">NRF_GPIO_PIN_NOPULL</a>);
<a name="l00159"></a>00159   <a class="code" href="group__nrf__gpio.html#ga0271806dc37bffea02d199474d526a35" title="Configure given GPIO pin number as output with given initial value set, hiding inner details...">nrf_gpio_cfg_output</a>(<a class="code" href="group__pwm__example.html#gaf1aeb7e936e859c23ed991a5710cb38f">PWM_OUTPUT_PIN_NUMBER</a>);
<a name="l00160"></a>00160 
<a name="l00161"></a>00161   NRF_GPIO-&gt;OUT = 0x00000000UL;
<a name="l00162"></a>00162 
<a name="l00163"></a>00163   <span class="comment">// Configure GPIOTE channel 0 to toggle the PWM pin state</span>
<a name="l00164"></a>00164   <span class="comment">// Note that we can only connect one GPIOTE task to an output pin</span>
<a name="l00165"></a>00165   <a class="code" href="group__nrf__gpiote.html#gab8667667ddf3bdca874df3add96fb622" title="Config GPIOTE channel as output, setting the properly desired output level.">nrf_gpiote_task_config</a>(0, <a class="code" href="group__pwm__example.html#gaf1aeb7e936e859c23ed991a5710cb38f">PWM_OUTPUT_PIN_NUMBER</a>, <a class="code" href="group__nrf__gpiote.html#gga9a424db0997c11092f8f69d52155dd9da00487cd8286ff071ca751cd4a00295d5" title="Toggle.">NRF_GPIOTE_POLARITY_TOGGLE</a>, <a class="code" href="group__nrf__gpiote.html#ggab280bbb7269ab98a97e7b47d906ef9aaae0df1a0e930bfe3b198a9692d9916667" title="Low to high.">NRF_GPIOTE_INITIAL_VALUE_LOW</a>);
<a name="l00166"></a>00166 }
<a name="l00167"></a>00167 
<a name="l00170"></a><a class="code" href="group__pwm__example.html#gaad16890c50156256e260b5205571ddc4">00170</a> <span class="keyword">static</span> <span class="keywordtype">void</span> <a class="code" href="group__pwm__example.html#gaad16890c50156256e260b5205571ddc4">ppi_init</a>(<span class="keywordtype">void</span>)
<a name="l00171"></a>00171 {
<a name="l00172"></a>00172   <span class="comment">// Power on the PPI peripheral</span>
<a name="l00173"></a>00173   NRF_POWER-&gt;PERPOWER |= (POWER_PERPOWER_PPI_Power &lt;&lt; POWER_PERPOWER_PPI_Pos);
<a name="l00174"></a>00174 
<a name="l00175"></a>00175   <span class="comment">// Wait for the power up</span>
<a name="l00176"></a>00176   <span class="keywordflow">while</span> ((NRF_POWER-&gt;PERRDY &amp; POWER_PERRDY_PPI_Msk) != (POWER_PERRDY_PPI_Ready &lt;&lt; POWER_PERRDY_PPI_Pos))
<a name="l00177"></a>00177   {
<a name="l00178"></a>00178   }
<a name="l00179"></a>00179 
<a name="l00180"></a>00180   <span class="comment">// Configure PPI channel 0 to toggle PWM_OUTPUT_PIN on every TIMER2 COMPARE[0] match</span>
<a name="l00181"></a>00181   NRF_PPI-&gt;CH0_EEP = (uint32_t)&amp;NRF_TIMER2-&gt;EVENTS_COMPARE[0];
<a name="l00182"></a>00182   NRF_PPI-&gt;CH0_TEP = (uint32_t)&amp;NRF_GPIOTE-&gt;TASKS_OUT[0];
<a name="l00183"></a>00183 
<a name="l00184"></a>00184   <span class="comment">// Configure PPI channel 1 to toggle PWM_OUTPUT_PIN on every TIMER2 COMPARE[1] match</span>
<a name="l00185"></a>00185   NRF_PPI-&gt;CH1_EEP = (uint32_t)&amp;NRF_TIMER2-&gt;EVENTS_COMPARE[1];
<a name="l00186"></a>00186   NRF_PPI-&gt;CH1_TEP = (uint32_t)&amp;NRF_GPIOTE-&gt;TASKS_OUT[0];
<a name="l00187"></a>00187 
<a name="l00188"></a>00188   <span class="comment">// Configure PPI channel 1 to toggle PWM_OUTPUT_PIN on every TIMER2 COMPARE[2] match</span>
<a name="l00189"></a>00189   NRF_PPI-&gt;CH2_EEP = (uint32_t)&amp;NRF_TIMER2-&gt;EVENTS_COMPARE[2];
<a name="l00190"></a>00190   NRF_PPI-&gt;CH2_TEP = (uint32_t)&amp;NRF_GPIOTE-&gt;TASKS_OUT[0];
<a name="l00191"></a>00191 
<a name="l00192"></a>00192   <span class="comment">// Enable PPI channels 0-2</span>
<a name="l00193"></a>00193   NRF_PPI-&gt;CHEN = (PPI_CHEN_CH0_Enabled &lt;&lt; PPI_CHEN_CH0_Pos)
<a name="l00194"></a>00194                 | (PPI_CHEN_CH1_Enabled &lt;&lt; PPI_CHEN_CH1_Pos)
<a name="l00195"></a>00195                 | (PPI_CHEN_CH2_Enabled &lt;&lt; PPI_CHEN_CH2_Pos);
<a name="l00196"></a>00196 }
<a name="l00197"></a>00197 
<a name="l00198"></a>00198 
<a name="l00203"></a><a class="code" href="group__pwm__example.html#ga840291bc02cba5474a4cb46a9b9566fe">00203</a> <span class="keywordtype">int</span> <a class="code" href="group__gpio__example.html#ga840291bc02cba5474a4cb46a9b9566fe">main</a>(<span class="keywordtype">void</span>)
<a name="l00204"></a>00204 {
<a name="l00205"></a>00205   <a class="code" href="group__pwm__example.html#gad22626704ea5d45f863163500e355cc3">gpiote_init</a>();
<a name="l00206"></a>00206   <a class="code" href="group__pwm__example.html#gaad16890c50156256e260b5205571ddc4">ppi_init</a>();
<a name="l00207"></a>00207   <a class="code" href="group__pwm__example.html#ga9459bbd9d6c1f423f968799c09f96434">timer2_init</a>();
<a name="l00208"></a>00208 
<a name="l00209"></a>00209   <span class="comment">// Enable interrupt on Timer 2</span>
<a name="l00210"></a>00210   NVIC_EnableIRQ(TIMER2_IRQn);
<a name="l00211"></a>00211   __enable_irq();
<a name="l00212"></a>00212 
<a name="l00213"></a>00213   <span class="comment">// Start clock</span>
<a name="l00214"></a>00214   NRF_TIMER2-&gt;TASKS_START = 1;
<a name="l00215"></a>00215 
<a name="l00216"></a>00216   <span class="keywordflow">while</span> (<span class="keyword">true</span>)
<a name="l00217"></a>00217   {
<a name="l00218"></a>00218   }
<a name="l00219"></a>00219 }
<a name="l00220"></a>00220 
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